## ADDED Requirements

### Requirement: Order Package Invalidation CSV Template Download

The admin frontend SHALL let users creating an order package invalidation task download the CSV template used by the task's CSV upload field.

#### Scenario: Download the static CSV template

- **GIVEN** 用户已打开新建订单套餐作废任务抽屉
- **WHEN** 用户点击 CSV 上传项旁的模板下载入口
- **THEN** 页面 MUST 下载静态文件 `订单批量作废模板.csv`
- **AND** 下载内容 MUST match `src/template/订单批量作废模板.csv`, including the `order_no` header
- **AND** 页面 MUST NOT make a template-generation API request